Write down 10 things that you learned from watching this documentary
How earth was made?
Answers
Around 4.6 billion years ago, the Earth originated from a massive cloud of gas and dust known as the solar nebula.
Here are ten key points about the formation of Earth:
Nebular Hypothesis: Earth's formation is explained by the Nebular Hypothesis, which proposes that the solar system formed from a rotating disk of gas and dust.
Accretion: Small particles in the nebula collided and stuck together through a process called accretion, gradually forming planetesimals and protoplanets.
Planetesimal Collisions: Over time, planetesimals merged through collisions, leading to the formation of larger planetary bodies like Earth.
Differentiation: The heat generated by collisions and the decay of radioactive elements caused Earth to differentiate into layers with a dense metallic core, a mantle, and a crust.
Core Formation: The metallic core formed through the accretion of heavy elements, particularly iron and nickel.
Bombardment Period: During the early stages of Earth's formation, it experienced intense bombardment by leftover planetesimals and asteroids.
Water Delivery: Water was likely delivered to Earth through comets and asteroids during the Late Heavy Bombardment phase.
Atmosphere Formation: Earth's atmosphere gradually developed through outgassing from volcanic activity and the release of trapped gases from the interior.
Early Oceans: As Earth cooled down, water vapor condensed, leading to the formation of the Earth's oceans.
Habitability: Earth's distance from the Sun, its atmosphere, and the presence of liquid water have made it conducive to supporting life.
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Related Questions
The solubility product constant at 25°C for AgI(s) in water has the value 8.3 × 10–17. Calculate ∆Grxn at 25°C for the process AgI(s) <--> Ag+(aq) + I– (aq) where [Ag+] = 9.1 × 10–9 and [I–] = 9.1 × 10–9. –91.7 kJ/mol +91.7 kJ/mol 0.0 kJ/mol –4.4 kJ/mol +4.4 kJ/mol
Answers
Answer:
+91.7 KJmol-1
Explanation:
Recall that ∆G= -RTlnK
Since ∆G in this case is ∆Grxn and K is the Ksp
Note that the Ksp is the solubility product (as shown by the reaction equation)
∆Grxn is the change in free energy for the reaction, in this case the ionization of the silver iodide into silver and iodide ions.
R= 8.314JK-1 and T =25°C +273 = 298 K (the centigrade temperature must be appropriately converted to its corresponding absolute absolute before proceeding with the calculation)
Hence we can substitute values accordingly;
∆Grxn = -(8.314 × 298 × ln 8.3×10^-17)
∆Grxn = +91.7 KJmol-1
A 25.00 mL aliquot of a 0.100 M weak acid (Ka = 1.0 * 10-4) solution is titrated with a strong base. What is the approximate pH at the half-equivalence point? 2.00 4.00 8.00 10.00 6.00
Answers
Therefore, the approximate pH at the half-equivalence point is 4.00.
The correct answer is b) 4.00.
Chemistry uses a quantitative scale known as pH to categorize substances as acidic, basic, or neutral. Acidic substances are those that have a pH value lower than 7. For instance, acidic foods like vinegar, tamarind, lemon, etc. More than 7 means that the substance is fundamental in nature.
The half-equivalence point of a weak acid-strong base titration occurs when half of the weak acid has been neutralized by the strong base. At this point, we have an equal concentration of the weak acid and its conjugate base.
Since the Ka value is known for the weak acid, we can use the Henderson-Hasselbalch equation to calculate the approximate pH at the half-equivalence point:
pH = pKa + log ([A-]/[HA])
At the half-equivalence point, [A-] = [HA], so the logarithm term becomes log(1) = 0. Therefore, the pH at the half-equivalence point is approximately equal to the pKa of the weak acid.
Given that the Ka value is 1.0 × 10⁽⁻⁴⁾, the pKa is equal to -log(1.0 × 10⁽⁻⁴⁾) = 4.
Therefore, the approximate pH at the half-equivalence point is 4.00.
The correct answer is b) 4.00.
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PLEASE HELP ME IM SO STUCk
Answers
Answer: A
Explanation: ( 1% + 1%) - (1% + 3%) = -1/50 = -0.02
7) What is the density of sulfur dioxide, SO2, at
STP?
Answers
Answer:
The density of SO₂ is 2.858 g/L.
Explanation:
Given data:
Density of sulfur dioxide = ?
Given temperature = standard = 273 K
Given pressure = standard = 1 atm
Solution:
Formula used:
PM = dRT
P = pressure
M = molar mass
d = density
R = ideal gas constant
T = temperature
No we will put the values in formula
1 atm × 64.066 g/mol = d× 0.0821 atm.L/mol.K× 273 K
d =64.066 atm.g/mol /22.4133atm.L/mol
d = 2.858 g/L
The density of SO₂ is 2.858 g/L.
6 Which element requires the least amount of
energy to remove the most loosely held electron
from a gaseous atom in the ground state?
(1) Na
(3) P
(2) Ar
(4) Ci
Answers
Answer: 1) Na because it requires least amount of energy.
Na requires the least amount of energy to remove the most loosely held electron.
Why does Na have the least ionization enthalpy among the given elements?Electronic configuration of the elements:Na - [Ne] 3s¹
P - [Ne] 3s² 3p³
Ar - [Ne] 3s² 3p⁶
Cl - [Ne] 3s² 3p⁵
As it can be seen, Na after losing one electron from its outermost subshell attains a stable noble gas configuration. So, it will require a very less amount of energy i.e., ionization enthalpy, to remove that electron.P, which already has a half-filled subshell, will not readily lose the electrons and hence requires more amount of energy.Ar has the noble gas configuration i.e., all its subshells are fully filled. A very large amount of energy will be required to remove its electron.Learn more about ionization energy here:
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A receiving clerk notes that a delivery of 10 units has been received, but the purchase order specified 12 units. A debit memo will need to be prepared to adjust for the difference between the quantity ordered and received. Who should prepare this document
Answers
The **receiving clerk** should prepare the debit memo to adjust for the difference between the quantity ordered and received.
A **debit memo** is a document that records a financial transaction, specifically an adjustment made to an account. In this case, the receiving clerk needs to create a debit memo to account for the discrepancy between the 10 units received and the 12 units specified in the purchase order. This ensures accurate financial records and alerts the necessary parties to the missing items. The receiving clerk is responsible for verifying the quantity and quality of goods received, so they are the appropriate person to prepare this document. By doing so, they help maintain proper inventory management and facilitate communication between the company and its suppliers.
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what happens when magnesium is burnt in air?
Answers
It forms magnesium oxide by reacting with oxygen
The balanced equation is provided by
\(\\ \rm\hookrightarrow 2Mg+O_2=2MgO\)
On both sides
Mg=2O=2Hence balanced
what is the percentage yield of o 2if 12.3 g of kclo 3(molar mass 123 g) is decomposed to produce 3.2 g of o 2(molar mass 32 g) according to the equation below?
Answers
66.67% is the percentage yield of o 2if 12.3 g of KClO₃(molar mass 123 g) is decomposed to produce 3.2 g of o 2(molar mass 32 g) according to the equation .
To calculate the percentage yield of O₂, you need to determine the theoretical yield and compare it to the actual yield (3.2 g of O₂).
1. Determine the moles of KClO₃:
moles = mass / molar mass
moles of KClO₃ = 12.3 g / 123 g/mol = 0.1 mol
2. From the balanced equation, 2 moles of KClO₃ produce 3 moles of O₂:
moles of O₂ = (3/2) × moles of KClO₃ = (3/2) × 0.1 mol = 0.15 mol
3. Calculate the theoretical yield of O₂:
mass = moles × molar mass
theoretical yield of O₂ = 0.15 mol × 32 g/mol = 4.8 g
4. Calculate the percentage yield:
percentage yield = (actual yield / theoretical yield) × 100%
percentage yield = (3.2 g / 4.8 g) × 100% = 66.67%
The percentage yield of O₂ in this reaction is 66.67%.
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which scientist concluded that all cells came from existing cells?
Please help!!
Answers
Answer:
Theodor Schwann
Explanation:
The classical cell theory was proposed by Theodor Schwann in 1839. There are three parts to this theory
the reaction was begun with glacial (anhydrous) acetic acid and anhydrous ethyl alcohol (ethanol). the reaction would also work if you had started with a lower grade of acetic acid (80% m/m acetic acid in water) and 95% m/m ethanol, which are commonly available in chemistry stockrooms. what changes would you need to make in your calculation for keq if the reaction had been carried out with a lower grade of acetic acid and 95% ethanol, and therefore has some amount of water in the initial set-up of the reaction?
Answers
If the reaction had been carried out with a lower grade of acetic acid and 95% ethanol, and therefore has some amount of water in the initial set-up of the reaction, in order to accurately calculate the Keq, it would be necessary to include the concentration of water in the Keq calculation.
The reaction was initiated with glacial (anhydrous) acetic acid and anhydrous ethyl alcohol (ethanol). The reaction could also work if it was initiated with a lower grade of acetic acid (80% m/m acetic acid in water) and 95% m/m ethanol, which are generally available in chemistry stockrooms. This indicates that the reaction can be carried out using partially concentrated acetic acid and ethanol.
The expression for equilibrium constant Keq is given by:\(Keq}}=\frac{[\text{products}]^\text{stoichiometric coefficient}}{[\text{reactants}]^\text{stoichiometric coefficient}}\)
The Keq depends on the concentrations of the species involved in the chemical reaction. When water is added to the reaction, the concentration of the acetic acid would drop. As a result, it would be necessary to modify the Keq calculation.
In the given case, if the reaction is carried out with a lower grade of acetic acid and 95% ethanol, which has some water in the initial set-up of the reaction, then we have to consider the dissociation of acetic acid in water:
CH3COOH + H2O ⇌ CH3COO- + H3O+
And the equilibrium constant expression for this reaction will be:
Keq = [CH3COO-][H3O+] / [CH3COOH][H2O]
Therefore, if the reaction is carried out with partially concentrated acetic acid and 95% ethanol, then it would be necessary to include the concentration of water in the Keq calculation.
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can I get help and please say the answer A, B, C or D
Answers
Answer: By mass, about 96 percent of our bodies are made of four key elements: oxygen (65 percent), carbon (18.5 percent), hydrogen (9.5 percent) and nitrogen (3.3 percent). These elements do not give color to fireworks, but they are found in our body’s most abundant and important molecules, including water, proteins and DNA. The answer is B.
Explanation: I hope this helps. I got it from search.
300mL of 0.83mol/L acetic acid reacts with 12.0g of sodium carbonate at 21 C and 100.3kPa. What volume of dry carbon dioxide is released in this reaction? Water vapour pressure at this temperature is 2.49 kPa.
Answers
Answer:
The volume that carbon dioxide release is 2.83L
Explanation:
The reaction of acetic acid (CH₃COOH) with sodium carbonate (Na₂CO₃) is:
2 CH₃COOH + Na₂CO₃ →Na₂(CH₃COO)₂ + CO₂ + H₂O
Moles of acetic acid and sodium carbonate (Molar mass: 105.99g/mol) in the reaction are:
Acetic acid: 0.300L ₓ (0.83mol / L) = 0.249 moles.
Sodium carbonate: 12g ₓ (1mol / 105.99g) = 0.113 moles.
Based on the chemical equation, 2 moles of acetic acid reacts per moles of sodium carbonate. For a complete reaction of sodium carbonate you need:
0.113 moles Na₂CO₃ ₓ (2 moles CH₃COOH / 1 mole Na₂CO₃) = 0.226 moles of CH₃COOH
As you have 0.249 moles, Na₂CO₃ is limitng reactant.
As 1 mole of sodium carbonate produce 1 mole of CO₂, from 0.113 moles of Na₂CO₃ you obtain 0.113 moles of CO₂
Using PV = nRT, it is possible to find the volume that a gas occupies, thus:
V = nRT / P
n = 0.113 moles
R = 8.314 kPa×L/mol×K
T = 21°C + 273.15 = 294.15K
P = 100.3kPa - 2.49kPa = 97.81kPa
The vapor pressure is subtracted because is the pressure that water exerted.
Replacing:
V = 0.113mol×8.314 kPa×L/mol×K×294.15K / 97.81kPa
V = 2.83L
The volume that carbon dioxide release is 2.83LWhich person do you agree with the most?
A Casey: The human population had been fairly constant throughout
Earth's history.
Allayna: Population size is increasing at a significant rate due to
advances in technology, medicine, and sanitation.
© Karl: Population size has been decreasing over time because people
are having fewer children.
Answers
Describe the nature of electrochemical process.
Answers
Answer:
electrochemical process is a chemical reaction caused by the applied electrical current.
Explanation:
Electrochemical processes involve the transfer of electrons between chemical species, resulting in the conversion of chemical energy into electrical energy or vice versa.
Through redox reactions, chemical energy can be transformed into electrical energy or vice versa in electrochemical processes. They happen where an electrode and an electrolyte solution meet. In these procedures, electrons are moved from the electrode to the electrolyte, causing an electric current to flow.
While reduction takes place at the cathode, where electrons are obtained, oxidation happens at the anode, where electrons are expelled. Numerous applications, such as batteries, fuel cells, corrosion, electroplating, and electrolysis, depend on electrochemical processes.
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Question 4
1 pts
A person's heartbeat is 77 beats per minute. If his/her heart beats 3.1e9 times in a lifetime, how
long (in whole years) does the person live? Disregard leap years.
Answers
The person lives 76 1/2 years. if the heartbeat is 77 beats per minute.
A heartbeat is a two-part pumping movement that takes approximately a 2nd. As blood collects within the top chambers of the proper and left atria, the coronary heart's herbal pacemaker the SA node sends out an electrical signal that reasons the atria to settle.
77 beats = 1 minute
Let X = 3.1*10⁹ beats
X = (3.1*10⁹ beats * 1 minute) / 77 beats = 40259740.26 minutes.
Now, we express this amount of time in years.
1 year=365 day
365 days=365 day*(24 hour/1day)*(24 hour /1day)*(60 minutes /1hour)=
=525600 minutes.
525600 minutes = 1 year
40259740.26 minutes = 40259740.26 /525600
= 76.59 ≈ 76 1/2 years.
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A student prepares a standardized solution of sodium hydroxide by the following procedure. The student first prepares a saturated solution of sodium hydroxide using freshly distilled or deionized water. She measures about 5 mL with a graduated cylinder and dilutes to 1 L in a plastic bottle with freshly distilled or deionized water to make a solution that is about 0.1 M. To determine the exact concentration she puts the NaOH solution in a buret and titrates a carefully-weighed pre-dried solid acid of known molar mass. She records the volume of NaOH needed to neutralize it and repeats the process several times to determine the concentration of the NaOH solution. She calculates the concentration and uncertainty in the concentration of the NaOH from the titration data. Why can\'t the student just weigh the sodium hydroxide directly to make a standard? Select all that apply. NaOH pellets react with water. NaOH pellets react with oxygen. NaOH pellets react with hydrogen. NaOH pellets react with carbon dioxide. NaOH pellets react with nitrogen. Why did the student first prepare a saturated solution? A. Saturated solutions are higher in purity than unsaturated solutions. B. Unsaturated NaOH solutions are light-sensitive. C. She can calculate the concentration of the saturated NaOH solution from the Ksp of NaOH. D. Any sodium hydrogen carbonate formed by the reaction of NaOH with atmospheric carbon dioxide will precipitate in the saturated solution. The student prepares the NaOH solution of high purity but unknown concentration by taking about 5 mL of the supernatant at the top of the saturated solution adding it to a plastic bottle with about 1 L of freshly distilled or deionized water. The bottom of the solution contains some white solids which are likely to be (select all correct answers): sodium hydroxide sodium hydrogen sulfate sodium silicate CO2(s) H2O(s) phthalic acid sodium hydrogen carbonate Why is a plastic bottle is generally preferred to glass bottle during the above step? A. The reaction between sodium hydroxide and plastic produces plastic hydroxide. B. Sodium hydroxide renders plastic inert by a process called passivation. C. Sodium hydroxide reacts slowly with glass, forming sodium silicate. D. Sodium hydroxide reacts with polyethylene. The concentration of saturated NaOH is 50.0% w/w and the density is 1.52 g/mL. If exactly 4.00 mL were diluted to 1.000 L, what would be the concentration? Why is potassium acid phthalate (KHC8H4O4, MM = 204.227 g/mol) so widely used as a standard in acid-base titrations? Select all that apply. It is stable to air It is expensive It is easy to dry It has a slowly changing pH at the equivalence point It has a relatively high molar mass It is available in high purity A student dries the pure potassium acid phthalate (KHC8H4O4) in the oven overnight to A. remove water B. purify the matrix C. remove carbon dioxide adn sulfer dioxide D. anneal the crystal structure She weighs 0.1553 g of dry potassium acid phthalate into a flask and adds some water from a graduated cylinder to dissolve it. Why doesn\'t she measure the volume of water with a more accurate device? A. The accuracy of the graduated cylinder is sufficient to measure to two decimal places which is all the precision needed for a titration. B. It would be better to measure the mass because it can be read to four decimal places with an analytical balance. C. The quantity of water actually is important and should be measured accurately because it affects the starting concentration thus the starting pH of the solution. D. The volume of water added is not important because the titration equivalence point depends only on the number of millimoles of potassium acid phthalate and not its concentration. The titration of 0.1553 g of dry potassium acid phthalate (MM = 204.227 g/mol) requires 49.84 mL of NaOH solution. What is the concentration of the NaOH solution? Why is freshly distilled or deionized water used in this standardization? A. Freashly distilled water contains no hydrogen peroxide B. Distilles water contains calcium, which stabilizes the sodium hydroxide C. Freashly deionized water has a pH of 4.72 D. There is little CO2 in freshly deionized or distilled water
Answers
NaOH has the characteristic of being deliquescent; hence, it cannot be weighed directly; rather, a saturated solution is diluted to get the appropriate concentration.
The process of deliquescent is explained using sodium hydroxide.
When a material absorbs moisture and carbon dioxide from the air to the point that it becomes dissolved and forms a solution, this process is known as deliquescence.
Who or what uses hydroxide?To make soap, rayon, paper, explosive materials, colors, and petroleum products, manufacturers can employ sodium hydroxide. Processing cotton fabric, cleaning and processing metal, applying an oxide layer, electroplating, and electrolytic extraction are further uses for sodium hydroxide.
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elements 72zn, 75as, and 74ge have the . question 8 options: same number of neutrons same number of neutrons and electrons same number of protons same number of protons and electrons
Answers
The elements 72Zn, 75As, and 74Ge all have a different number of protons, which means they are different elements. Zinc has 30 protons, arsenic has 33 protons, and germanium has 32 protons. However, the question is not about the number of protons, but rather about the number of neutrons and electrons.
In order to determine whether these three elements have the same number of neutrons and electrons, we need to look at their atomic masses. Zinc has an atomic mass of 72, which means it has 42 neutrons. Arsenic has an atomic mass of 75, which means it has 42 neutrons as well. Germanium has an atomic mass of 74, which means it has 42 neutrons as well. Therefore, all three elements have the same number of neutrons.
When it comes to electrons, all neutral atoms have the same number of electrons as they do protons. Therefore, the number of electrons in each of these elements is equal to their respective number of protons. In summary, elements 72Zn, 75As, and 74Ge have the same number of neutrons, but they have different numbers of protons and electrons.
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If the temperature outside is 75oF and the dew point is 75oF what is the humidity?
Answers
Answer:
in this file you will find it https://xlbrands.com/wp-content/uploads/2014/06/DEW-POINT-CALCULATION-CHARTenglish.pdf
Explanation:
the gas in a 275.0 ml piston experiences a change in pressure from 1.45 atm to 2.10 atm. what is the new volume (in ml) assuming the moles of gas and temperature are held constant?
Answers
In this question, we are given with the volume at initial point i.e. 275ml that undergoes the change in pressure from 1.45atm to 2.10 atm.
We are asked to determine the final volume after the change.
For that we'd consider the Boyle's law that states that, for a gas in an iso-thermic system Pressure is inversely proportional to the Volume.
which means with the increase in Pressure, Volume of gas will reduce.
At constant Temperature, product of Pressure and Volume will be constant.
PV = constant.
for same system at different pressure volume condition, we can say that-
PV=pv
where,
P=Initial pressure = 1.45 atm
p= Final pressure = 2.10 atm
V= Initial Volume = 275 ml
v= Final volume, to be determined in this question
PV = pv
(1.45)(275) = (2.10)v
Final Volume= (1.45)(275)/(2.10)
Final Volume = 189.88 ml
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the isotope sodium-24 has a half-life of 15 hours. starting with 22 grams, how much remains in 60 hours?
Answers
Approximately 1.375 grams of sodium-24 remains after 60 hours.
The half-life of sodium-24 is 15 hours, which means that after every 15 hours, half of the remaining sodium-24 will decay.
To calculate the amount of sodium-24 remaining after 60 hours, we can divide the total time (60 hours) by the half-life (15 hours) to determine the number of half-life intervals.
Number of half-life intervals = 60 hours / 15 hours = 4 intervals
Since each half-life interval results in a halving of the amount, we can calculate the remaining amount of sodium-24 by multiplying the initial amount (22 grams) by (1/2) four times:
Remaining amount of sodium-24 = 22 grams * (1/2)^4 = 22 grams * (1/16) ≈ 1.375 grams
Therefore, approximately 1.375 grams of sodium-24 remains after 60 hours.
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Which of the following are used to make
predictions?
hypotheses
laws
theories
Answers
Answer:A hypothesis is a tentative explanation that can be tested by further investigation. A theory is a well-supported explanation of observations. A scientific law is a statement that summarizes the relationship between variables. An experiment is a controlled method of testing a hypothesis.
Explanation:
Explanation: If the theory is true, it allows scientists to make predictions about what they observed.
What is the pH of a solution that has 7.8x10-9 [H+]?
Answers
Answer:
8.11
Explanation:
pH = -log[H+]
pH = -log[7.8 x \(10^{-9}\)]
pH = 8.107905...
pH = 8.11
How can the properties of a substance be used to identify it?
Answers
Answer:
The chemical properties of a substance can be determined by performing experiments that use specific materials pr processes with known characteristics
Explanation:
If a specific material affects the substance in a specific way then the substance has a particular property. However if the property changes the substance, then more properties can be deduced
1. A fossil is the remains or traces of organisms that lived in the past.
Which statement is TRUE about fossils? *
A fossil never includes a complete organism.
A fossil shows the evolution of an entire species.
Much of the evidence for evolution comes from fossils.
Fossils have provided a complete history of Earth's life forms.
Answers
Answer:
Is this from edge?
if so which lesson is it from and is this an assignment or a quiz?
I think the answer is C (Much of the evidence for evolution comes from fossils.)
A fossil is the remains or traces of organisms that lived in the past.The statement is true about fossils is much of the evidence for evolution comes from fossils. Therefore, option C is correct.
What are fossils ?Any surviving remains, impression, or evidence of a once-living thing from a previous geological epoch is referred to as a fossil. Examples include exoskeletons, bones, shells, animal or microbe imprints in stone, items preserved in amber, hair, petrified wood, and DNA traces. The fossil record is the collection of all fossils.
The remains or evidence of prehistoric life that have been preserved by natural processes are known as fossils. Shells, bones, animal or microbe imprints in stone, exoskeletons, items preserved in amber, petrified wood, coal, hair, oil, and DNA traces are a few examples of fossils.
The majority of fossils are created when a living thing (such as an animal or plant) dies and is swiftly buried by sediment (such as mud, sand or volcanic ash).
Thus, option C is correct.
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36 g of Zinc reacted with hydrochloric acid to produce zinc chloride Salt and hydrogen gas. Calculate (i) the mass of hydrochloric acid used (ii) the mass of slat produced (iii) the mass of hydrogen gas produced.
Answers
Answer: A
Explanation:
just add
Which of the following accurately describes metallic bonding?
A. electrons sea of delocalized
B. electrons are shared between atoms
C. electrons are transferred between atoms
D. electrons are released as beta particles
The answer is not C that's all I know. Please answer with explanation if you know.
Answers
Answer:
A
Explanation:
give an expression that relates the rate of disappearance of each reactant to the rate of appearance of each product. PCl3 + Cl2 --------> PCl5
Answers
In the reaction PCl3 + Cl2 → PCl5, the rate of disappearance of each reactant is related to the rate of appearance of the product.
You can express this relationship using the following equation:
Rate = - (1/1) * (d[PCl3]/dt) = - (1/1) * (d[Cl2]/dt) = (1/1) * (d[PCl5]/dt)
Here, d[PCl3]/dt, d[Cl2]/dt, and d[PCl5]/dt represent the rate of change of concentrations of PCl3, Cl2, and PCl5, respectively. The negative signs for the reactants indicate their concentrations are decreasing, while the positive sign for the product indicates its concentration is increasing. The coefficients (1/1) account for the stoichiometry of the reaction.
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A 5.0g sample of Cu(NO3)2•nH2O is heated, and 3.9g of the anhydrous salt remains. what is the value for n?
Answers
Answer: 2.9
Explanation:
Molar mass of Cu(NO3)2 = 187.5 g/mol
Molar mass of water = 18.0 g/mol
%H2O = (5.0 g - 3.9 g) / 5.0 g X 100 (100 is to get percent) = (1.1 g) / 5.0 g X 100
= 22.0 %
% H2O = ( mass of H20 alone) / (mass of total hydrate)
0.22 = 18.0n / (18.0n + 187.5)
n = 2.9 = (about) 3
When a 5.0g sample of Cu(NO₃)₂ . nH₂O is heated, and 3.9g of the anhydrous salt remains. The value of n is 3.
How to find the the amount of water lost ?Water mass = Hydrate mass - Anhydrous mass
= 5.0 - 3.9
= 1.1 g water
How to find the number of moles ?Number of moles = \(\frac{\text{Given mass}}{\text{Molar mass}}\)
Now find the moles of H₂O and moles of Cu(NO₃)₂.
Moles of H₂O = \(\frac{\text{Mass of water}}{\text{Molar mass of water}}\)
= \(\frac{1.1\ g}{18\ g/mol}\)
= 0.061 moles
Moles of Cu(NO₃)₂ = \(\frac{\text{Mass of}\ Cu(NO_{3})_{2}}{\text{Molar mass of}\ Cu(NO_{3})_{2}}\)
= \(\frac{3.9\ g}{187.5\ g/mol}\)
= 0.0208 moles
Ratio of moles of H₂O and moles of Cu(NO₃)₂.
= \(\frac{0.061}{0.0208}\)
= 2.9
≈ 3
The value of n is 3. So the formula will be Cu(NO₃)₂ . 3H₂O.
Thus, from above conclusion we can say that when a 5.0g sample of Cu(NO₃)₂ . nH₂O is heated, and 3.9 g of the anhydrous salt remains. The value of n is 3.
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ce
Which Computer Program enables a user to surf
the internet
Surf
Answers
Answer:
Search engine. Example - Google. Hope this helps and please mark as the brainliest
Explanation:
which of the following methods is used to obtain
colored light from a filament lamp?
A. additive
B. subtractive
C. multiplicative
D. divisible I
Answers
The method used to obtain colored light from a filament lamp is additive. A filament lamp is a device that emits white light when it's turned on. However, the light can be made to appear colored by using a technique called additive color mixing. In this method, colored filters are used to filter the white light emitted by the filament lamp. The colored filters absorb some of the light wavelengths and allow others to pass through. When different colored filters are used, the colors of the light that passes through them combine to produce a new color. This method is called additive because the colors of light are added together to produce a new color.
The correct option is A. additive.